Direnv / bash / zsh config to use standard ssh-agent when being accessed over ssh

.envrc

# direnv config for remote shells
#
# When logged in over SSH (no Touch ID), bypass 1Password's SSH agent for GitHub
# by forcing git's SSH to use a user-level remote config (password-based, no biometric).
# Also disable git commit signing since it requires 1Password agent.

if [ -n "${SSH_CONNECTION-}" ] || [ -n "${SSH_CLIENT-}" ] || [ -n "${SSH_TTY-}" ]; then

  export SSH_AUTH_SOCK="$HOME/.ssh/ssh-agent.sock"
  if ! ssh-add -l >/dev/null 2>&1; then
    rm -f "$SSH_AUTH_SOCK"
    eval "$(ssh-agent -a "$SSH_AUTH_SOCK")" >/dev/null
  fi

  export GIT_SSH_COMMAND="ssh -F ~/.ssh/config_remote"
  export GIT_CONFIG_COUNT=1
  export GIT_CONFIG_KEY_0="commit.gpgsign"
  export GIT_CONFIG_VALUE_0="false"
fi

ssh_remote_config

Host *
  IdentityAgent ~/.ssh/agent.sock
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes
  AddKeysToAgent yes